Wells – Processes – Distinct – separate injection and producing wells
Patent
1975-04-18
1976-11-23
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166263, 166270, 166288, E21B 4322, E21B 4324, E21B 33138
Patent
active
039931331
ABSTRACT:
An improved process for decreasing the permeability of a subterranean oil-bearing formation which comprises injecting an aqueous surfactant solution containing a chemically crosslinkable, water-dispersible polymer which prevents the surfactant from foaming until it is in the formation and after the polymer breaks down due to heat in the formation caused by steam which is used to carry the aqueous solution into the formation. In accordance with one embodiment, gelled or ungelled cellulose ether polymers in an aqueous surfactant solution are injected with steam into the more permeable or more depleted portions of a subterranean oil-bearing formation to produce a selective blocking due to the formation of foam in the more permeable sections of the formation which forces the remaining injection steam to produce oil from less depleted portions of the formation.
REFERENCES:
patent: 3204694 (1965-09-01), Johnson
patent: 3373814 (1968-03-01), Eilers et al.
patent: 3412793 (1968-11-01), Needham
patent: 3530940 (1970-09-01), Dauben et al.
patent: 3682244 (1972-08-01), Bowman et al.
patent: 3727687 (1973-04-01), Clampitt et al.
patent: 3785437 (1974-01-01), Clampitt et al.
Novosad Stephen J.
Phillips Petroleum Company
Suckfield George
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